Liquid control valve



' Aug.'12, 1941. R. w. DE LANCEY 2,252,459

LIQUID CONTROL VALVE,

Filed Oct. 5, 1940 INVENTOR ATTORNEY Patented Aug. 12, 1941 LIQUIDCONTROL VALVE Ralph W. De Lancey, Meriden, Conn, assignor to The MillerCompany, Meriden, Conn, a corporation of Connecticut Application October5, 1940, Serial No. 359,872

4 Claims.

The present invention relates to liquid control valves, and is moreparticularly directed toward liquid control valves for controlling theflow of fuel to oil burners.

It is customary to provide a constant level 5 metal cup. The parts areadjusted so that the valve to control the flow of fuel to oil burners,upper edge of the float I5 is well above the normal this valvemaintaining a constant level of fuel level of liquid in the reservoir.in a reservoir. Inasmuch as it is possible that A weight [6 is pivotedat ll adjacent the exthe control valve may fail to function and permittension IS on the valve stem [2. This weight is continued leakage intothe reservoir it is neces- 10 held up by a latch element It pivoted at21} and sary to provide a supplemental safety feature carrying an arm 21from which hangs a dome whereby the valve mechanism may be more seshapedliquid level responsive member or float curely closed in response to thecontinued leak- 22. The lower edge 23 of the member 22 is age of thevalve. normally just above the bottom of the float The present inventioncontemplates improve- I5 when the float is in its upper position. mentsin safety mechanisms for this purpose, Should the oil continue to leakinto the reserand according to the present invention the float V aamount to raise the level 1 t0 the p which normally operates to controlthe opening of the float l5, it will then flow over into this andclosing of the valve responsive to liquid level float. Only a very smallamount of oil will he is open at the top so that in the event ofconnecessary to close the seal across the bottom tinued leakage fuel mayoverflow into the float. 0f the float 22 that the in it is pp This floatreceives a second liquid level respon- T on eontimled leakage y a S a aou sive element normally held at a predetermined of Oil necessary tofill the sp b e e level so as not to interfere with the normal 25 o s we necessary o materially n e se operation of the primary controlmechanism. the b y y 0f the o e p d er This second liquid level controlmechanism nors member 22 wi t e fo e tend to rise and mally holds up aweighted member and acts upon this will disconnect the latch element i9perthe flowing of oil into the first float to release mittihg the Weightto p On to e op f the weighted member so that it c n d d the valve stemthereby forcing the valve stem engage the valve mechanism to force it toclosed to s d position d v ly s oppin th position. flow of fuel.

The accompanying drawing shows for pu The device will operate in thesame manner poses of illustrating the present invention, one Should thefleet l5 a S0 that the fuel flows of the many embodiments in which theinvention into the inside of the floatmay take form, it being understoodthat the It is Obvious that e invention may be emdrawing is illustrativeof the invention rather bodied in many forms d t ens W th n thanlimiting the same. the scope of the claims and I wish it to be under- Inthe drawing: stood that the particular form shown is but one Figure 1 ia v rti 1 sectional View through of the many forms. Variousmodifications and a constant level valve having the safety featureChanges being p s I do not otherwise limit above referred t and myselfin any Way with respect thereto.

Figure 2 is a sectional View taken on the line What is a f is:

of Figure 1. In combinatlon, a reservoir adapted to con= In the drawinga reservoir is indicated at ill. t t normally Open .inlet valve t admitIt has an inlet valve mechanism designated genfigl g g gg gz i gfis iifzfi fi fig b emuy at and Plovlded w1th lower normally reaches apredetermined height, the mechanism open servlce valve lid and an uppernormally including a float having an open top so that open emergencyvalve lib. Each of these valves on continued leakage of the Valve liquidmay 15 Operated m Sequence by the downwardmove' overflow into the float,a second vertically movament of a valve stem i2, as shown and describedble float having a normal lower position in which in my app icationSerial No. 349,844, filed Auit is received in the first float when thelatter gust 2, 1940. A simple needle valve may be is in its upperposition and adapted to be parsubstituted.

The plunger I2 is normally moved downwardly by a lever I3 pivoted at [4and connected to a float member It. This float member is, asrindi= catedin the drawing, in the form of an open tially immersed in the liquidoverflowing into the first float whereby the said second float is buoyedupwardly, a weight normally held in its upper position when the secondfloat is in its normal position and released when the second float risesso that it drops, and a valve closing element engageable by the weight.

2. The combination as claimed in claim 1, wherein the support for thesecond float includes a latch which supports the weight.

3. The combination as claimed in claim 1, 10

wherein the second float is dome shaped and open at the bottom so thatair is trapped therein by the liquid in the first float.

4. The combination as claimed in claim 1, wherein the walls of thefloats are closely spaced so that overflowing liquid produces a buoyancyin the second float to release the weight before the first float isfilled sufficiently to lose its buoyancy and sink.

RALPH W. DE LANCEY.

